Predicting bone remodeling in response to total hip arthroplasty: computational study using mechanobiochemical model

Area of Science:

• Biomedical Engineering
• Orthopedic Surgery
• Computational Mechanics

Background:

• Periprosthetic bone loss is a critical complication of total hip arthroplasty (THA), potentially leading to implant failure.
• Understanding bone remodeling dynamics post-THA is crucial for developing durable prosthetic designs.

Purpose of the Study:

• To simulate and quantify femoral bone density changes following THA using a thermodynamic-based model.
• To investigate the spatial distribution of bone loss and apposition in response to the implant.

Main Methods:

• A thermodynamic-based theory coupling mechanical loading and biochemical affinity was employed.
• Three-dimensional finite element analysis (3D FEA) was used to simulate bone density variations.
• Numerical simulations predicted density changes across different Gruen zones of the femur.

Main Results:

• Significant bone loss was observed in Gruen zone 7 (-17.93%) and zone 1 (-13.77%).
• Zone 7 showed initial bone loss followed by a 9% recovery and stabilization.
• Zone 4 exhibited bone densification (+4.63%), and posterior regions experienced greater loss than anterior regions.

Conclusions:

• The study provides quantitative insights into periprosthetic bone density variations after THA.
• The thermodynamic model accurately predicts bone remodeling patterns, aligning with clinical observations and literature.
• Findings aid in designing long-lasting hip prostheses by understanding mechanical and biochemical influences on bone.